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                  <p><small><a name="what_is_paq_file_format"></a>PeaZip
is a free cross-platform file archiver and paq files compression
utility that
provides an unified
portable GUI for many Open Source technologies like 7-Zip, FreeArc,
PAQ, UPX... free alternative to WinRar, WinZip and </small><small>similar
proprietary software</small><small>.<br>
- Create 7Z, ARC, BZ2, GZ, PAQ / LPAQ / ZPAQ, PEA, QUAD/BALZ, TAR, UPX,
WIM, XZ, ZIP
files<br>
- Open and extract ACE, ARJ, CAB, DMG, ISO, LHA,
RAR, UDF, ZIPX files and more,</small><small> over 200 archive types
supported</small><small><br>
Features of PeaZip includes: paq </small><small> </small><small>archives
opener and extractor, </small><small>batch creation and </small><small>extraction
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archives at once, </small><small>convert files, </small><small>create
self-extracting archives, split and join files,
strong encryption with two factor authentication, encrypted password
manager, </small><small>secure deletion, </small><small>find
duplicate files, </small><small>calculate hash and checksum,
export job definition as script.</small></p>
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            <td colspan="1" rowspan="1" style="vertical-align: top;"> <br>
            <h1 style="text-align: center;"><big><big><big><a
 name="paq_file_format"></a>What is PAQ file compression format<br>
            </big></big></big></h1>
            <br>
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 style="width: 50%; vertical-align: middle; background-color: rgb(255, 255, 255);">
            <div> </div>
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                  <td style="vertical-align: top;">
                  <ul>
                    <li>
                      <p><a href="#zpaq_file_format">WHAT
ARE PAQ, LPAQ, ZPAQ FILES<br>
                      </a></p>
                    </li>
                  </ul>
                  <p style="text-align: left;"> </p>
                  </td>
                  <td style="vertical-align: top; width: 128px;">
                  <h2><img
 title="PAQ, LPAQ, ZPAQ file types specifications"
 alt=".paq file extension" src="file-format/file-format.png"
 style="width: 96px; height: 96px;" align="right"></h2>
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            <td
 style="background-color: rgb(255, 255, 255); vertical-align: top;">
            <div style="text-align: left; color: rgb(0, 0, 0);">
            <h2><big><big><big><a name="zpaq_file_format"></a><a
 href="#paq_file_format">What are PAQ, LPAQ, ZPAQ files<br>
            </a></big></big></big></h2>
            </div>
            <br>
            <div style="text-align: left;"> </div>
            <div style="text-align: left;"> </div>
            <a name="paq_algorithm_family"></a>PAQ is a family lossless
file compression algorithms, top ranking in data compression contests
like Hutter Prize and holding several records for maximum compressio
ratio in those competitions.<br>
PAQ algorithm family is based on multiple stategies to reduce
redundancies in data, including neural networks, and aims to reduce
compressed size of the data as near as possible to the quantity of
information enthropy contained in the input - which cannot be further
reduced without loss of information.<br>
LPAQ is a related project form same author, Matt Mahoney, and provides
less computing-intensive faster compression, roughly one order of
magnitude, at the cost of inferior compression compated to PAQ, but
still comparable or superior to mainstream compression formats like 7Z,
ARC, RAR, ZIPX at maximum copression settings.<br>
LPAQ is a pure compression format, unlike paq and zpaq, so multiple
files needs to be consolidated in a single TAR container before lpaq
compression.<br>
ZPAQ designates the current evolution of PAQ/LPAQ project, providing a
backward compatible standard format supporting incremental archiving
and journaling, and AES256 encryption.<br>
ZPAQ executable is multi threaded, and features a more flexible
compression
mechanism, ranging from speed / compression ratio tradeoff similar to
Deflate for lower compression settings up to better than PAQ for
highest compression settings.<br>
See <a href="peazip-compression-benchmark.html">file compression
benchmark</a> page to see how ZPAQ compares for compression ratio and
speed to strongest compressor algorithms, as LZMA/PPMD employed in 7Z,
ARC, RAR and ZIPX formars.<br>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; text-align: right; width: 128px;">
                  <h2><span style="font-weight: bold;"><img
 title="What are PAQ format features and specifications"
 alt="ZPAQ file format" src="file-format/quotes.png"
 style="width: 32px; height: 32px;"></span></h2>
                  </td>
                  <td style="vertical-align: top; font-style: italic;">
                  <h3><span style="font-weight: bold;">When is PAQ
compression
recommended</span></h3>
PAQ family is unrivaled in the field of maximum compression, but it is
very computing intensive; those formats are recommended when it is
desired to effectively reach the best possibile copression ratio.<br>
ZPAQ, being also capable of faster and lighter compression, in the
range of Deflate-based formats (ZIP, GZip) is more eclectic and is
suitable to be used as general purpose compressor, especially for
user-level backup tasks due the built in capability of incremental
archiving / incremental backup (add newer and modified files only) and
journaling (maintaing multiple copies of modified files).<br>
                  </td>
                  <td style="vertical-align: bottom; width: 128px;">
                  <h3><img
 title="What is PAQ file compression algorithm family"
 alt="LPAQ file format" src="file-format/quotes-inverse.png"
 style="width: 32px; height: 32px;"></h3>
                  </td>
                </tr>
              </tbody>
            </table>
            <a name="paq_format_specs"></a>Read more about *PAQ
project: <a target="_blank" href="http://mattmahoney.net/dc/">PAQ
family
official domain<img title="PAQ project"
 alt="PAQ data compression software domain" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="http://mattmahoney.net/dc/">ZPAQ project<img
 title="ZPAQ project"
 alt="ZPAQ Incremental Journaling Backup Utility and Archiver"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="https://en.wikipedia.org/wiki/PAQ">PAQ page on
Wikipedia<img title="PAQ page on Wikipedia" alt="PAQ format wiki"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a><br>
            <br>
PeaZip supports <a href="paq-files-compression-utility.html">creation
and
extraction of paq, lpaq, and zpaq files</a>: create, open, browse,
test, and
extract *paq
archives, optionally extract all revision of files contained in the
archive, convert any supported archive to paq and zpaq format and
vice-versa.<br>
            <h2><img title="What is PAQ format compression"
 alt="what are paq files" src="add-to-archive.png"
 style="width: 100px; height: 45px;"></h2>
            <h3><img title="What is a PAQ file and how to extract"
 alt="what ia a PAQ archive" src="extract-archive.png"
 style="width: 112px; height: 45px;"></h3>
            <br>
            <table
 style="background-color: rgb(72, 136, 248); width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="1">
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                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;">&nbsp;&nbsp;
                        <br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <table style="width: 100%; text-align: left;"
 border="0" cellpadding="0" cellspacing="0">
                          <tbody>
                            <tr>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">
                              <h3><big><big><big><big><big><a
 name="zpaq_file_extension"></a>.ZPAQ</big></big></big></big></big></h3>
                              </td>
                              <td
 style="width: 50%; color: rgb(245, 245, 245); vertical-align: middle;">Author
Matt Mahoney, 2009<br>
2^32 max number of files<br>
250 TB bytes max input size<br>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>SPEED <img alt="paq specifications"
 title="7z compression / extraction speed" src="zip-files/star3.png"
 style="width: 80px; height: 16px;"></big></h4>
ZPAQ is extremely flexible in terms of speed.<br>
The algorithm is very computing intensive as compression level
increases, but multithreading support, and several optimizations over
its PAQ predecessor, makes it usable for general purpose at least at
medium compression levels on current generation machines.<br>
At lower compression settings speed / compression tradeoff is quite
similar to Deflate, making it compete with fast archiving formats.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;">
                        <h4><big>COMPRESSION
RATIO <img alt="zpaq features" title="7z compression performances"
 src="zip-files/star5.png" style="width: 80px; height: 16px;"></big></h4>
ZPAQ compression algorithm provides state of art compression ratio,
outperforming even high compression formats like 7Z, RAR, and ZIPX at
maximum compression settings<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td
 style="vertical-align: top; color: rgb(245, 245, 245); width: 430px;"><big>ADVANCED
OPTIONS <img alt="paq specs" title="7z format options"
 src="zip-files/star4.png" style="width: 80px; height: 16px;"></big><br>
ZPAQ format natively supports journaling and incremental archiving /
incremental backup, and natively supports AES256 encryption,<br>
Error recovery is currently not supported.<br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
                      <tr>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 430px;"><br>
                        </td>
                        <td style="vertical-align: top; width: 24px;"><br>
                        </td>
                      </tr>
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 href="7z-file-format.html">7Z COMPRESSED FILE FORMAT FEATURES</a><br>
                  </small></td>
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            <small><small>&nbsp;</small></small><br>
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                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="cab-file-format.html">WHAT IS CAB FILE FORMAT</a><br>
                  </small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="what-is-rar-file.html">WHAT ARE RAR ARCHIVES</a><br>
                  </small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="tar-file-format.html">TAR FILE FORMAT SPECIFICATIONS</a><br>
                  </small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="wim-files.html">WHAT IS MICROSOFT WIM FILE FORMAT</a><br>
                  </small></td>
                </tr>
              </tbody>
            </table>
            <small><small>&nbsp;</small></small><br>
            <table style="text-align: left;" border="0" cellpadding="6"
 cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="zip-file-format.html">ZIP FILE EXTENSION</a><br>
                  </small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="file-compression-performances.html">HOW TO IMPROVE FILE
COMPRESSION</a><br>
                  </small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="archive-file-formats-comparison.html">ARCHIVE AND COMPRESSION
FORMATS COMPARISON</a></small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="convert-files.html">CONVERT ZIP TO 7Z FORMAT<br>
                  </a></small></td>
                </tr>
              </tbody>
            </table>
            <small><small>&nbsp;</small></small><br>
            <table style="text-align: left;" border="0" cellpadding="6"
 cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="encrypt-files.html">CREATE ENCRYPTED 7Z FILES</a></small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="self-extracting-archives.html">CREATE 7Z SELF EXTRACTING ARCHIVES<br>
                  </a></small></td>
                  <td style="vertical-align: top;"><small><br>
                  </small></td>
                  <td
 style="vertical-align: top; background-color: rgb(240, 239, 238);"><small><a
 href="arc-file-format.html">WHAT IS ARC FILE TYPE</a><a
 href="self-extracting-archives.html"><br>
                  </a></small></td>
                </tr>
              </tbody>
            </table>
            <p> </p>
            <p><a href="peazip-help-faq.html">FAQ</a>
&gt; Archive file types &gt; What are Paq, Lpaq, Zpaq files<br>
            </p>
Topics about what are PAQ, LPAQ, ZPAQ file extensions, *PAQ family
providing maximum
compression ratio, with ZPAQ format implementing strongest compression
algorithm currently available, characteristics,
advantages and disadvantages compared to other high compression
formats:
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="6" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">what are
paq files,<br>
faq about paq compressors family,<br>
paq compression algorithm,<br>
how paq compares to rar for maximum compression ratio,<br>
strongest compression algorithm,<br>
zpaq vs arc file format,<br>
most powerful compression type,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">what is
.lpaq file extension,<br>
zpaq compression algorithm,<br>
what is zpaq file type,<br>
best compression algorithm,<br>
what are lpaq compressed files,<br>
paq compared to arc compression,<br>
best file compression format,<br>
zpaq format speed,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">what are
paq archives,<br>
specs of zpaq file format,<br>
how paq compares with zipx for maximum compression ratio,<br>
.zpaq file extension,<br>
zpaq format specifications,<br>
                  <h4>neural networks compression,</h4>
best compression performances,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">specifications
of paq file type,<br>
highest compression format,<br>
how paq compression ratio compares to 7z compression,<br>
paq neural network,<br>
.paq file extension,<br>
formats for high compression,<br>
maximum compression format<br>
                  </td>
                </tr>
              </tbody>
            </table>
            </td>
          </tr>
        </tbody>
      </table>
      <table
 style="background-color: rgb(255, 255, 255); margin-left: auto; margin-right: auto; width: 960px; text-align: left;"
 border="0" cellpadding="24" cellspacing="0">
        <tbody>
          <tr>
            <td style="vertical-align: top;">Tag Cloud<br>
            <span class="wrd free-rar4" id="paq-file-fomat"> <a
 href="paq-file-format.html">PAQ files</a></span> <span
 class="wrd free-rar1" id="paq-file-compressor"> <a
 href="paq-files-compression-utility.html">create PAQ files</a></span> <span
 class="wrd free-rar3" id="paq-file-type"> <a
 href="paq-file-format.html">ZPAQ file format</a></span> <span
 class="wrd free-rar0" id="paq-neural-network-compression-algorithm"> <a
 href="paq-file-format.html">neural network compression algorithm</a></span>
            <span class="wrd free-rar2"
 id="free-paq-file-opener-utility"> <a
 href="paq-files-compression-utility.html">open PAQ files</a></span> <span
 class="wrd free-rar3" id="lpaq-file-fomat"> <a
 href="paq-file-format.html">LPAQ file type</a></span><span
 class="wrd free-rar2" id="zip-file-format"> <a
 href="zip-file-format.html">ZIP format</a></span> <br>
            <span class="wrd free-rar1"
 id="create-new-7z-tar-zip-archive"> <a
 href="how-to-compress-files-folders.html">create new compressed archive</a></span>
            <span class="wrd free-rar0" id="compress-to-separate-files">
            <a href="how-to-zip-files-separate-archives.html">add to
separate archives</a></span> <span class="wrd free-rar1"
 id="extract-selected-content"> <a
 href="how-to-extract-selected-files-from-archive.html">extract
selected files</a></span> <span class="wrd free-rar3"
 id="open-7z-rar-zip-files"> <a
 href="how-to-open-rar-tar-zip-files.html">how to open 7z rar tar zip
files</a></span> <span class="wrd free-rar0"
 id="file-hashing-checksum-tools"> <a href="verify-checksum-hash.html">checksum
hash tool</a></span> <span class="wrd free-rar1" id="lzma-file-format">
            <a href="7z-file-format.html">7Z files</a></span> <br>
            <span class="wrd free-rar1" id="how-to-extract-archives"> <a
 href="how-to-extract-rar-zip-archives.html">extract 7Z RAR TAR ZIP
files</a></span> <span class="wrd free-rar4"
 id="free-7zip-files-extraction-tool"> <a
 href="7zip-files-utility.html">open 7Z archives</a></span><span
 class="wrd free-rar1" id="download-free-encryption-software"> <a
 href="index.html">download
free
encryption software</a></span> <span class="wrd free-rar0"
 id="open-source-encryption-software"> <a href="encrypt-files.html">how
to encrypt files</a></span> <span class="wrd free-rar1"
 id="split-file-spanning-how-to"> <a href="file-split.html">how to
split files</a></span> <span class="wrd free-rar4" id="free-rar"> <a
 href="free-rar.html">free RAR</a></span> <br>
            <span class="wrd free-rar3" id="free-zip"> <a
 href="zip-files-utility.html">free ZIP</a></span> <span
 class="wrd free-rar0" id="portable-rar-files-software"> <a
 href="peazip-portable.html">portable 7Z RAR ZIP software</a></span> <span
 class="wrd free-rar3" id="what-is-rar-file-extension"> <a
 href="what-is-rar-file.html">RAR file format</a></span> <span
 class="wrd free-rar1" id="secure-file-deletion-program"> <a
 href="secure-delete.html">secure
delete</a></span> <span class="wrd free-rar3"
 id="windows-tar-files-viewer"> <a href="tar-windows.html">TAR file
extraction</a></span> <span class="wrd free-rar2"
 id="what-is-zip-file-format"> <a href="zip-file-format.html">
ZIP file format</a></span> <span class="wrd free-rar4"
 id="arc-file-extension"> <a href="arc-file-format.html">ARC format</a></span><br>
            <span class="wrd free-rar0" id="open-zipx-files-reader"> <a
 href="zipx-files-software.html">ZIPX
file extraction</a></span> <span class="wrd free-rar3"
 id="zipx-file-extension"> <a href="zipx-files-software.html">ZIPX
file extension</a></span> <span class="wrd free-rar2"
 id="file-compression-formats-comparison"> <a
 href="archive-file-formats-comparison.html">comparison of file
compression formats</a></span> <span class="wrd free-rar0"
 id="convert-compressed-files"> <a href="convert-files.html">convert
PAQ files</a></span> <span class="wrd free-rar4"
 id="file-compression-archiver-application"> <a href="index.html">free
file archiver</a></span><br>
            <span class="wrd free-rar1"
 id="archive-format-highest-file-compression-ratio"> <a
 href="archive-file-formats-comparison.html">what archive format has
highest file compression ratio</a></span> <span class="wrd free-rar3"
 id="best-file-compression-utility"> <a
 href="peazip-compression-benchmark.html">best file
compression software</a></span> <span class="wrd free-rar2"
 id="free-backup-utility"> <a href="backup-files.html">free backup
software</a></span> <br>
            </td>
          </tr>
        </tbody>
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      </td>
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 style="vertical-align: top; background-color: rgb(243, 242, 241);">
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            <td style="vertical-align: top; width: 25%;"><small> <img
 alt="paq maximum compression" src="titles.png"
 style="width: 129px; height: 2px;"><br>
            <a name="paq_maximum_compression_ratio"></a>DOWNLOADS<br>
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 style="width: 129px; height: 2px;"><br>
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 style="width: 129px; height: 2px;"><br>
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